Commit e53d77eb authored by Sasha Levin's avatar Sasha Levin Committed by Linus Torvalds

autofs4: check dev ioctl size before allocating

There wasn't any check of the size passed from userspace before trying
to allocate the memory required.

This meant that userspace might request more space than allowed,
triggering an OOM.
Signed-off-by: 's avatarSasha Levin <sasha.levin@oracle.com>
Signed-off-by: 's avatarIan Kent <raven@themaw.net>
Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0bf1457f
......@@ -103,6 +103,9 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
if (tmp.size < sizeof(tmp))
return ERR_PTR(-EINVAL);
if (tmp.size > (PATH_MAX + sizeof(tmp)))
return ERR_PTR(-ENAMETOOLONG);
return memdup_user(in, tmp.size);
}
......
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